EP0867899A2 - Kontaktlose Energieübertragungseinrichtung - Google Patents

Kontaktlose Energieübertragungseinrichtung Download PDF

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Publication number
EP0867899A2
EP0867899A2 EP98105424A EP98105424A EP0867899A2 EP 0867899 A2 EP0867899 A2 EP 0867899A2 EP 98105424 A EP98105424 A EP 98105424A EP 98105424 A EP98105424 A EP 98105424A EP 0867899 A2 EP0867899 A2 EP 0867899A2
Authority
EP
European Patent Office
Prior art keywords
oscillation circuit
oscillation
power transfer
secondary winding
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98105424A
Other languages
English (en)
French (fr)
Other versions
EP0867899A3 (de
EP0867899B1 (de
Inventor
Hideki Tamura
Mikihiro Yamashita
Yoshinori Katsura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Works Ltd
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Filing date
Publication date
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Publication of EP0867899A2 publication Critical patent/EP0867899A2/de
Publication of EP0867899A3 publication Critical patent/EP0867899A3/de
Application granted granted Critical
Publication of EP0867899B1 publication Critical patent/EP0867899B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00034—Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge

Definitions

  • the present invention relates to a noncontacting power transfer apparatus for transferring power between a primary winding on the side of a power source device and a secondary winding on the side of a load device in a noncontacting manner by electromagnetic induction.
  • a circuit configuration as shown in Fig. 13 has been proposed.
  • the noncontacting power transfer apparatus when a housing of a load device 2 incorporating a secondary winding L 3 for power transfer is located at a prescribed position of a housing of a power source device 1 incorporating a primary winding L 1 for power transfer, power is transferred from the primary winding L 1 for power transfer to the secondary winding L 3 for power transfer in a noncontacting manner by electromagnetic induction. Namely, the power is transferred from the power source device 1 to the load device 2.
  • a series circuit is connected across a smoothing capacitor C 0 , which has an LC resonance circuit of a parallel circuit of a resonance capacitor C 1 and the primary winding L 1 , a transistor Q 1 which is a switching element and a resistor R 2 ; another series circuit having a resistor R 1 and a capacitor C 2 is connected across the smoothing capacitor C 0 ; a connecting point of the resistor R 1 and the capacitor C 2 is connected to the base of the transistor Q 1 through a feedback winding L 0 magnetically coupled with the primary winding L 1 .
  • a commercial power source AC is rectified and smoothed by the diode D 0 and smoothing capacitor C 0 .
  • a secondary battery E B to be charged is connected to the secondary winding L 3 for power transfer through a diode D 5 , the voltage outputted from the secondary winding L 3 is rectified by the diode D 5 , and the secondary battery E B is charged by the DC voltage thus rectified.
  • a load M such as a DC motor is connected to the secondary battery E B through a switch SW 1 which turns on/off by the operation of an operation unit (not shown).
  • a signal is transferred in a noncontacting manner by electromagnetic induction from the primary winding L 4 for signal transfer to the secondary winding L 2 for signal transfer on the side of the power source device.
  • the signal received by the secondary winding L 2 for signal transfer is rectified and smoothed by the diode D 1 and capacitor C 3 , and the voltage thus rectified/smoothed is applied to the base of the transistor Q 2 .
  • a transistor Q 2 turns on so that the base voltage of the transistor Q 1 drops.
  • the transistor Q 1 turns off to stop oscillation.
  • the transistor Q 2 turns on so that the transistor Q 1 turns off to stop oscillation.
  • a power transformer T 1 for power transformer including the primary winding L 1 and the secondary winding L 3 is independent of a single transformer T 2 for control signal transfer including a primary winding L 4 and the secondary winding L 2 , so that the respective windings L 1 to L 4 are wound on different cores. For this reason, several cores are required to make the production cost high, and a large space for installing the cores is required to make it difficult to miniaturize the power transfer apparatus. Further, where high power is to be transferred, the transformer T 1 for power transfer is large-scaled which makes it difficult to miniaturize the entire power transfer apparatus.
  • the primary winding L 1 for power transfer and the secondary winding L 2 for signal transfer must be spaced apart from each other by a suitable distance.
  • the secondary winding L 3 and the primary winding L 4 for signal transfer must be also spaced from each other. This also makes it difficult to miniaturize the entire apparatus and hence the load device 2.
  • the present invention has been accomplished in view of the above circumstance. Its object is to provide a noncontacting power transfer apparatus which can be miniaturized and reduced in production cost.
  • the present invention provides a noncontacting power transfer apparatus for transferring power from a primary winding for power transfer to a secondary winding for power transfer in a noncontacting manner by electromagnetic induction in a state where a load device incorporating the secondary winding is arranged at a prescribed position of a power source device, characterized in that said power source device includes a first oscillation circuit having said primary winding, a secondary winding for receiving a signal from said load device and a driving control circuit for controlling oscillation in said first oscillation circuit on the basis of an output from said secondary winding for signal transfer; said load device includes said secondary winding for power transfer magnetically coupled with said primary winding for power transfer in a state where it is arranged at a predetermined position of said power source device, a second oscillation circuit oscillating on the output from the secondary winding for power transfer, and a primary winding for signal transfer connected to said second oscillation circuit and magnetically coupled with said secondary winding for signal transfer in said state; and said first oscillation circuit and said second oscillation circuit
  • the primary winding for power transfer and said secondary winding for signal transfer may be wound on a core whereas said secondary winding for power transfer and said primary winding for signal transfer may be wound on another core in the aforementioned configulation.
  • This configuration permits the number of cores to be reduced as compared with the prior art and hence the load device, power source device and the entire apparatus to be miniaturized and reduced in production cost. Since both load device and power source device have only to include a single core, the size of the core can be increased as compared with the prior art, thus permitting higher power to be transferred as compared with the prior art.
  • the power source device preferably includes a filter circuit for extracting a signal from said primary winding for signal transfer between said secondary winding for signal transfer and said driving control circuit.
  • a signal from the load device can be surely transferred to the driving control circuit, thereby suitably controlling the first oscillation circuit.
  • the driving control circuit may control said first oscillation circuit on the basis of the presence or absence of an output from the secondary winding for signal transfer. In this configuration, the power can be controlled during no load, thus realizing power saving.
  • the load device preferably includes a switch for stopping oscillation of said second oscillation circuit, said switch being arranged in said second oscillation circuit.
  • the oscillation of the second oscillation circuit can be surely stopped. Therefore, by stopping oscillation when a battery element, for example, has been charged, power from the side of the power source device can be also controlled.
  • the second oscillation circuit may comprises an LC oscillation circuit and an inductor in said LC oscillation circuit serves as said primary winding for signal transfer.
  • the number of circuit components can be reduced, thus further miniaturizing the power transfer apparatus.
  • the LC oscillation circuit may include a switch for stopping its oscillation.
  • the oscillation of the LC oscillation circuit can be surely stopped. Therefore, by stopping oscillation when a battery element, for example, has been charged, power from the side of the power source device can be also controlled.
  • the LC oscillation circuit can be designed in a configuration of a series resonance circuit, and a switch for stopping oscillation of said LC oscillation circuit is inserted between said LC oscillation circuit and ground. In this configuration, the oscillation of the LC oscillation circuit can be surely stopped. Therefore, by stopping oscillation when a battery element, for example, has been charged, power from the side of the power source device can be also controlled.
  • the resonance frequency of said secondary winding for signal transfer and the oscillation frequency of said LC oscillation circuit are preferably set to be different from each other. This configuration is a preferred embodiment of the present invention.
  • a diode may be inserted between a collector of a transistor for driving said LC oscillation circuit and said inductor. This configuration prevents the collector potential of the driving transistor from becoming a negative potential, thus realizing continuous oscillation.
  • a rising RC time constant of a base potential of the transistor for driving said LC oscillation circuit can be set to be sufficiently shorter than the period of oscillation of said second oscillation circuit.
  • the base potential when the driving transistor turns on after it has turned off rises fast, thus lengthening the period while the LC oscillation circuit oscillates.
  • Fig. 1 shows a circuit diagram of a noncontacting power transfer apparatus according to this embodiment.
  • a power source device 1 rectifies and smooths a commercial power source AC through a diode bridge DB and a capacitor C 0 .
  • a series circuit (oscillation circuit) of an LC resonance circuit which includes a resonance capacitor C 1 and a primary winding L 1 , and a transistor Q 1 serving as a switching element are connected across the smoothing capacitor C 0 .
  • a driving control circuit 3 which on/off controls the transistor Q 1 to adjust the power to be transferred from the primary winding L 1 for power transfer to a secondary winding L 3 for power transfer on the side of a load device 2, is connected across the smoothing capacitor C 0 .
  • the secondary winding L 3 is magnetically coupled with the primary winding L 1 for power transfer to produce a secondary output and a secondary battery E B which is a charging battery is connected across the secondary winding L 3 for power transfer through a diode D 5 so that the secondary battery E B is charged by the secondary output.
  • a load M such as a DC motor is connected through a switch SW 1 which is turned on/off by operating an operation unit (not shown).
  • an oscillation circuit 6 and a primary winding L 4 are connected across the secondary winding L 3 for power transfer through a diode D 6 .
  • the load device 2 includes a control circuit 5 which serves to detect the voltage across the secondary battery 6 and produce a signal for stopping the oscillation of the oscillation circuit 6 when the voltage reaches a prescribed value.
  • the primary winding L 1 for power transfer and the secondary winding L 2 for signal transfer included in the housing 10 of the power source device 1 are wound on a single C-shape core 15 whereas the secondary winding L 3 for power transfer and primary winding L 4 for signal transfer included in the housing 20 of the load device 2 are wound on a single C-shape core 25.
  • the transformer for power transfer and the transformer for signal transfer are provided individually, the number of cores can be reduced, thereby miniaturizing the power source 1 and load device 2 and reducing their production cost.
  • the noncontacting power transfer apparatus can be miniaturized and reduced in production cost. Since the number of cores can be reduced, the size of the core can be increased as compared with the prior art, and large power can be transferred from the power source device 1 to the load device 2 without large-scaling the power transfer apparatus as compared with the prior art.
  • the driving control circuit 3 When power is turned on, the driving control circuit 3 produces a voltage V 1 as shown in Fig. 3(a), and intermittently drives the transistor Q 1 .
  • the transistor Q 1 turns on, in the power source device 1, oscillation is started by an LC resonance circuit including the primary winding L 1 for power transfer and the resonance capacitor C 1 . Then, the voltage V 2 at the LC resonance circuit and the collector of the transistor Q 1 is such as shown in Fig. 3(b).
  • the secondary winding L 3 for power transfer is magnetically coupled with the primary winding L 1 for power transfer so that a voltage is induced in the secondary winding L 3 for power transfer.
  • the voltage is rectified by the diode D 5 and the DC voltage thus rectified charges the secondary battery E B .
  • the voltage induced in the secondary winding L 3 for power transfer is applied to the oscillation circuit 6 through the diode D 6 .
  • An oscillation occurs in the oscillation circuit 6 so that a signal is transferred from the primary winding L 4 for signal transfer to the secondary winding L 2 by electromagnetic induction in a noncontacting manner.
  • the voltage generated in the secondary winding L 2 for signal transfer includes the component of the frequency f 1 and that of the frequency f 2 which are superposed on each other.
  • the driving control circuit 3 In the power source device 1, only the signal having the frequency f 2 is extracted from the voltage generated in the secondary winding L 2 for signal transfer by the filter circuit 4. The signal thus extracted is supplied to the driving control circuit 3 through the diode D 4 . In response to this signal, the driving control circuit 3 falls in continuous driving to produce a voltage V1 as shown in Fig. 4(a). Then, the voltage V 2 at the connecting point of the above LC resonance circuit and transistor Q 1 provide a voltage as shown in Fig. 4(b), thereby transferring prescribed power to the load device 2. In other words, the driving control circuit 3 provides intermittent driving before the load device 2 is set in the power source device 1 (see Fig. 3(a)). After the load device 3 is set, the driving control circuit 3 falls in continuous driving (see Fig. 4(a)).
  • the oscillation frequencies f 1 and f 2 are made different, power can be transferred from the power source device 1 to the load device 2 and the signal can be transferred from the load device 2 to the power source device 1.
  • the power/signal transfer transformer having of windings L 1 to L 4 can be miniaturized, and the entire power transfer apparatus can be miniaturized.
  • Fig. 5 is a circuit diagram of a noncontacting power transfer apparatus according to this embodiment.
  • the basic circuit configuration and basic operation according to this embodiment is substantially the same as embodiment 1.
  • the oscillation circuit 6 on the side of the load device 2 is constructed as a Colpitts oscillation circuit, and the inductor of the Colpitts oscillation circuit wound on the core 25 (see Fig. 2) on the side of the load device 2 serves as the primary winding L 4 for signal transfer in the first embodiment.
  • the remaining structure, which is the same as the first embodiment, will not be explained here.
  • Reference symbol E B in Fig. 5 denotes a secondary battery serving as a charging element.
  • Reference symbol SW 1 denotes a switch which turns on/off according to the operation of an operation unit (not shown).
  • a filter circuit 4 has an inductor L 01 , a diode D 01 , a capacitor C 01 , C 02 and C 03 , a resistor R 01 , etc.
  • Reference symbol L 5 denotes a power winding for the Colpitts oscillation circuit.
  • the oscillation is constructed as a Colpitts oscillation circuit
  • the circuit configuration of the oscillation circuit 6 can be simplified and the inductor of the Colpitts oscillation circuit serves as the primary winding L 4 for signal transfer.
  • the number of components can be reduced, thereby realizing miniaturization and low costing.
  • the noncontacting power transfer apparatus is designed in such a circuit configuration as shown in Fig. 6 on the side of the load device 2.
  • the configuration on the side of the power source device 1 is the same as in the first and second embodiments.
  • the base potential of the transistor Q 3 may be lowered to the ground level.
  • the inductor of the Colpitts oscillation circuit serves as the primary winding L 4 so that the frequency of power to be transferred from the power source device 1 to the load device 2 is carried on the primary winding L 4 for signal transfer. For this reason, even if the base potential of the transistor Q 3 is lowered to the ground level, the resonance circuit including the primary winding L 4 for signal transfer and the capacitors C 5 , C 6 is in a state where energy is always supplied thereto so that the oscillation in the resonance cannot be stopped.
  • a switch SW 2 for stopping oscillation is inserted within the resonance circuit including the primary winding L 4 and the capacitors C 5 , C 6 . For this reason, when the voltage across the secondary battery E B which is a charging element, by switching off the switch SW 2 through the control circuit 5, the oscillation of the resonance circuit can be stopped completely.
  • the switch SW 2 may be an pnp-type transistor Q 5 as shown in Fig. 7.
  • the base voltage of the pnp-type transistor Q 5 may be controlled by the control circuit 5.
  • the oscillation in the resonance circuit can be surely stopped by providing the switch SW 2 within the resonance circuit of the oscillation circuit 6 like the third embodiment.
  • use of the pnp transistor Q 5 serving as the switch SW 2 increases the production cost.
  • the oscillation circuit 6 is designed as the Colpitts oscillation circuit having a series resonance circuit structure as shown in Fig. 8, and the switching element Q 4 is provided between the ground and the resistor R 6 connected to the emitter of the npn-type transistor Q 3 in the oscillation circuit 6.
  • the switching element Q 4 is designed to be turned on/off by the signal supplied from the control circuit 5 to the base.
  • the inductor of the Colpitts oscillation circuit which operates as the oscillation circuit 6 serves as the primary winding L 4 .
  • the inductance value of the above inductor (primary winding L 4 for signal transfer) is changed under the influence of the transformer on the power side constituted by the primary winding L 1 for power transfer and secondary winding L 2 for signal transfer.
  • the inductance value also depends on the frequency.
  • Fig. 9(a) shows changes in the inductance value of the inductor.
  • the inductance value of the above inductance varies as indicated in solid line a in Fig. 9(a) when the power source device 1 and the load device 2 are separated with each other.
  • the inductance value varies as indicated by broken line b in Fig. 9(a) so that the inductance value changes in the neighborhood of frequency f A greatly.
  • the frequency f A is substantially equal to the resonance frequency defined by the primary winding L 1 for power transfer or secondary winding L 2 for signal transfer and a floating capacitor between the windings L 1 and L 2 .
  • Fig. 9(b) shows the frequency characteristic of the impedance of the secondary winding L 2 .
  • the oscillation frequency of the Colpitts oscillation circuit is equal to, for example, a frequency f A , where the capacitance of the capacitor constituting the Colpitts oscillation circuit fluctuates
  • the oscillation frequency when the housing 20 of the load device 2 is located at the predetermined position of the housing 10 of the power source device 1 varies greatly.
  • the inductance value decreases so that the oscillation frequency is shifted to a higher frequency.
  • the inductance value increases so that the oscillation frequency is shifted to a lower frequency.
  • the filter circuit 4 since the filter circuit 4 must extract or separate the signal from the load device 2, the oscillation frequency of the Colpitts oscillation circuit must be shifted from the above resonance frequency.
  • the oscillation frequency of the Colpitts oscillation circuit is not shifted from the above resonance frequency so greatly.
  • the basic configuration of this embodiment is substantially the same as that of the fourth embodiment, but different from the fourth embodiment in only that as shown in Fig. 10, a diode D 11 is inserted between the one end of the primary winding L 4 for signal transfer and the collector of the driving transistor Q 3 of the oscillation circuit 6. Only the difference will be explained.
  • Fig. 11 shows the waveform of the collector potential of the driving transistor Q 3 when the diode D 11 is not inserted. As seen from Fig. 11, the collector potential of the driving transistor Q 3 drops to the value not higher than the ground level for each period. This is attributable to the influence of the frequency (resonance frequency defined by the primary winding L 1 for power transfer and the resonance capacitor C 1 ) used to transfer the power by electromagnetic induction from the power source device 1 to the load device 2.
  • the frequency resonance frequency defined by the primary winding L 1 for power transfer and the resonance capacitor C 1
  • the collector potential of the driving transistor Q 3 is as shown in Fig. 12 in which the collector potential does not reach the negative potential.
  • the Colpitts oscillation occurs continuously. Accordingly, in accordance with this embodiment, the signal from the load device 2 can be transferred to the power source device 1.
  • the diode D 11 is not inserted, but the one end of the primary winding L 4 is directly connected to the collector of the driving transistor Q 3 in the oscillation circuit according to the fifth embodiment.
  • the capacitance of the capacitor C 7 and the resistance of the resistor R 3 are set suitably so that the oscillation period of the oscillation circuit is sufficiently shorter than that the oscillation period (which is defined by the resonance frequency of the resonance circuit including the primary capacitor L 1 for power transfer and the resonance capacitor C 1 ) in the power source device 1.
  • the present invention provides a noncontacting power transfer apparatus for transferring power from a primary winding for power transfer to a secondary winding for power transfer in a noncontacting manner by electromagnetic induction in a state where a load device incorporating the secondary winding is arranged at a prescribed position of a power source device, characterized in that said power source device includes a first oscillation circuit having said primary winding, a secondary winding for receiving a signal from said load device and a driving control circuit for controlling oscillation in said first oscillation circuit on the basis of an output from said secondary winding for signal transfer; said load device includes said secondary winding for power transfer magnetically coupled with said primary winding for power transfer in a state where it is arranged at a predetermined position of said power source device, a second oscillation circuit oscillating on the output from the secondary winding for power transfer and a primary winding for signal transfer connected to said second oscillation circuit and magnetically coupled with said secondary winding for signal transfer in said state; and said first oscillation circuit and said second oscillation circuit have different oscillation frequencies.
  • said primary winding for power transfer and said secondary winding for signal transfer may be wound on a core whereas said secondary winding for power transfer and said primary winding for signal transfer may be wound on another core.
  • This configuration permits the number of cores to be reduced as compared with the prior art and hence the load device, power source device and the entire apparatus to be miniaturized and reduced in production cost. Since both load device and power source device have only to include a single core, the size of the core can be increased as compared with the prior art, thus permitting higher power to be transferred as compared with the prior art.
  • the power source device can include a filter circuit for extracting a signal from said primary winding for signal transfer between said secondary winding for signal transfer and said driving control circuit.
  • a signal from the load device can be surely transferred to the driving control circuit, thereby suitably controlling the first oscillation circuit.
  • the driving control circuit preferably controls said first oscillation circuit on the basis of the presence or absence of an output from the secondary winding for signal transfer. In this configuration, the power can be controlled during no load, thus realizing power saving.
  • the load device preferably includes a switch for stopping oscillation of said second oscillation circuit, said switch being arranged in said second oscillation circuit.
  • the oscillation of the second oscillation circuit can be surely stopped. Therefore, by stopping oscillation when a battery element, for example, has been charged, power from the side of the power source device can be also controlled.
  • the second oscillation circuit may comprises an LC oscillation circuit and an inductor in said LC oscillation circuit serves as said primary winding for signal transfer. In this configuration, the number of circuit components can be reduced, thus further miniaturizing the power transfer apparatus.
  • the LC oscillation circuit preferably includes a switch for stopping its oscillation.
  • the oscillation of the LC oscillation circuit can be surely stopped. Therefore, by stopping oscillation when a battery element, for example, has been charged, power from the side of the power source device can be also controlled.
  • the LC oscillation circuit may be designed in a configuration of a series resonance circuit, and a switch for stopping oscillation of said LC oscillation circuit may be inserted between said LC oscillation circuit and ground. In this configuration, the oscillation of the LC oscillation circuit can be surely stopped. Therefore, by stopping oscillation when a battery element, for example, has been charged, power from the side of the power source device can be also controlled.
  • a diode may be inserted between a collector of a transistor for driving said LC oscillation circuit and said inductor. This configuration prevents the collector potential of the driving transistor from becoming a negative potential, thus realizing continuous oscillation.
  • a rising RC time constant of a base potential of the transistor for driving said LC oscillation circuit is preferably set to be sufficiently shorter than the period of oscillation of said second oscillation circuit.
  • the primary winding for power transfer and the secondary winding for signal transfer are wound on a core whereas the secondary winding for power transfer and the primary winding for signal transfer are wound on another core as shown in Fig. 2.
  • the present invention can be applied to such an embodiment that the primary winding for power transfer and the secondary winding for signal transfer are respectively wound on two cores separated with each other, or the secondary winding for power transfer and the primary winding for signal transfer are respectively wound on two cores separated with each other.
  • a power source device 1 when a load device is set at a predetermined position, transfers power in a noncontacting manner by electromagnetic induction from a primary winding L 1 for power transfer to a secondary winding L 3 for power transfer.
  • a secondary battery E B is charged by the secondary output of the secondary winding L 3 for power transfer.
  • a driving control circuit 3 when receiving the output from the secondary winding L 2 for signal transfer through a filter circuit 4, changes a transistor Q 1 from intermittent driving to continuous driving.
  • the primary winding L 1 for power transfer and the secondary winding L 2 for signal transfer are wound on a single C-shape core, whereas the secondary winding L 3 for power transfer and primary winding L 4 for signal transfer are wound on another single C-shape core 25.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Dc-Dc Converters (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Inverter Devices (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Surgical Instruments (AREA)
  • Power Steering Mechanism (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
EP98105424A 1997-03-26 1998-03-25 Kontaktlose Energieübertragungseinrichtung Expired - Lifetime EP0867899B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP7413497 1997-03-26
JP74134/97 1997-03-26
JP07413497A JP3363341B2 (ja) 1997-03-26 1997-03-26 非接触電力伝達装置

Publications (3)

Publication Number Publication Date
EP0867899A2 true EP0867899A2 (de) 1998-09-30
EP0867899A3 EP0867899A3 (de) 1999-07-21
EP0867899B1 EP0867899B1 (de) 2004-08-18

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98105424A Expired - Lifetime EP0867899B1 (de) 1997-03-26 1998-03-25 Kontaktlose Energieübertragungseinrichtung

Country Status (6)

Country Link
US (1) US5896278A (de)
EP (1) EP0867899B1 (de)
JP (1) JP3363341B2 (de)
CN (1) CN1153230C (de)
AT (1) ATE274230T1 (de)
DE (1) DE69825651T2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1176616A2 (de) * 2000-07-25 2002-01-30 Matsushita Electric Works, Ltd. Kontaktlose elektrische Energieübertragungsvorrichtung
GB2414120A (en) * 2004-05-11 2005-11-16 Splashpower Ltd Controlling inductive power transfer systems
US8054651B2 (en) 2006-08-09 2011-11-08 Mbda Uk Limited Simple and effective self regulating inductive power transfer system

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Publication number Priority date Publication date Assignee Title
DE19840620C1 (de) * 1998-09-05 2000-04-27 Steute Schaltgeraete Gmbh & Co Berührungsloser Sicherheitsschalter
US7385357B2 (en) 1999-06-21 2008-06-10 Access Business Group International Llc Inductively coupled ballast circuit
JP2001112190A (ja) * 1999-10-05 2001-04-20 Sharp Corp 非接触による電力及び信号伝達システム
KR100344532B1 (ko) * 2000-07-31 2002-07-24 삼성전자 주식회사 휴대용 컴퓨터용 에이씨/디씨 어댑터의 절전회로
JP4333519B2 (ja) * 2004-08-18 2009-09-16 サンケン電気株式会社 スイッチング電源装置
JP5005703B2 (ja) * 2005-12-02 2012-08-22 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 結合システム
CN100375370C (zh) * 2006-03-03 2008-03-12 重庆大学 可分区控制的电源板
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KR101624356B1 (ko) 2007-01-29 2016-06-07 파워매트 테크놀로지스 엘티디. 핀레스 파워커플러
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JPH10271713A (ja) 1998-10-09
US5896278A (en) 1999-04-20
EP0867899A3 (de) 1999-07-21
CN1153230C (zh) 2004-06-09
CN1194444A (zh) 1998-09-30
ATE274230T1 (de) 2004-09-15
DE69825651T2 (de) 2005-07-14
JP3363341B2 (ja) 2003-01-08
EP0867899B1 (de) 2004-08-18
DE69825651D1 (de) 2004-09-23

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